ETC8420,is programmable digital thermostat based on a microprocessor with a selectable relay or SSR control output for On/Off, P, PI, PD, PID action and soft start or self-tuning function. For the alarm output, selectable NO or NC relay offers 4 different output types. The unit is provided with configurable input for Pt100 and thermocouples (J, K, T, S, R). Optional RS485 module is available for communication via Modbus RTU protocol. Both the set and process values are viewed on a 2x4 digit display. ETC8420 allows 3 levels parameter protection to prevent authorized access to settings. Display & Keyboard | Process Value Display (PV) | 4 digits, 9.1 mm, 7 segment red LED | | Set value display (SV) | 4 digits, 12.5 mm, 7 segment yellow LED | | Mounting method | Suitable for flush-panel mounting | | Weight | Approx. 400g (after packing) | | Electrical Characteristics | | Supply |  230Vac +%10 -%20, 50/60Hz
24Vac ±%10, 50/60Hz
9-30Vdc / 7-24Vac ±%10 SMPS module | | Connection | 2.5 mm2 screw-terminal connections | | Entry | Selectable multi input (thermocouple or Pt100) | | Scale | Fe-Const (J) thermocouple : 0...600 C NiCr-Ni (K) thermocouple : 0...1200C Cu-Const (T) thermocouple : 0...400C Ptt10Rh-Pt (S) thermocouple : 0...1600C Pt13Rh-Pt (R) thermocouple : 0...1600 Pt100 resistance thermometer : -200...600C Pt100 resistance thermometer : -99.9...300.0C | | Accuracy | ±0.2% full scale ±1 digit | | Operation Temperature °C | 0...50 °C | | Data Retention | EEPROM (minimum 10 years) | | Control Output | 12Vdc 20mA logic out | | Alarm 1 Output | 1 relay: 250Vac, 2A (resistive load),NO/NC (select program) | | Control Algorithm | On-Off, P, PI, PD, PID (select program) | | Proportional Band | Adjustable between 0% and 100% | | Integral Time | Adjustable 0.0 and 100.0 min | | Derivative Time | Adjustable 0.00 and 25.00 min | | Control Period | Adjustable between 4 and 250s | | Hysteresis | Adjustable between 1 and 50C/F | | Output Power | The ratio of power at a set point can be adjusted between 0% and 100% |
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